Improvement in ice-boxes for refrigerators



- JOHN GRAVENSTINE.

improvement in l ce-Boxes for Refrigerators. ,NO. l27,762. Patented June H, 1872.

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UNITED STATES PATENT QFFICE.

JOHN GRAVENSTINE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN ICE-BOXES FOR REFRIGERATORS.

Specification forming part of Letters Patent No. 127,762, dated June 11, 1872.

Specification describing certain Improvements in Refrigerator IceBoxes, invented by J OHN GRAVENSTINE, of the city of Philadelphia and State of Pennsylvania.

This invention is an improvement on the ice-box described in my Letters Patent dated July 25, 1871, and numbered 117 ,408.

My invention relates to the construction of the ice-box with one or more flues for the passage of currents of air, as hereinafterfully described.

Figure l is a plan view of the improved icebox A. Fig. 2 is a cross-section at the line a b of Fig. 1. 

